FPPP: Fix comment indentation (#443)

Merge branch '3.x'

Use Tokens::class in lexer

Ref #441.

Drop two more getType() usages in builders

Switch some auxiliary pretty printer tables away from getType()

Instead use class names via ::class.

Add explicit getType() methods

Rather than automatically deriving getType() from the class name.

Merge branch '3.x'

Conflicts:
lib/PhpParser/NodeAbstract.php

Correctly determine Type of Node when PHP-Parser's namespaces are prefixed

Hi there,

I'm working on mutation testing framework ([Infection](https://github.com/infection/infection/))

Correctly determine Type of Node when PHP-Parser's namespaces are prefixed

Hi there,

I'm working on mutation testing framework ([Infection](https://github.com/infection/infection/)) that is distributed as a PHAR. One of this goal is to run target project's test suite against mutated code. Since we use reflection and load project's autoloader, we want to avoid potential conflicts between vendor files of Infection itself and the target project.

To avoid this issue, there is a project calld [PHP-Scoper](https://github.com/humbug/php-scoper). What it does is it prefixes all the namespaces of the library (including vendor folder) with some character(s), for example namespace `Infection\Mutator\PublicVisibility` is transformed to `ScoperAbc123\Infection\Mutant\PublicVisibility`.

But since it also prefixes vendor folder, PHP-Parser's classes are prefixed as well and `NodeAbstract::getType()` after this prefixing works incorrectly.

There is a hardcoded number `15` which means to remove `'PhpParser\Node'` (length=15) substring from the FQCN.

Code:

```php
// PHPParser\Node\Stmt\Declare_ -> Stmt_Declare

return strtr(substr(rtrim(get_class($this), '_'), 15), '\\', '_');
```

What I suggest is a little be more dynamic solution, to correctly extract class name (type) from the ***prefixed*** FQCL:

`ScoperAbc123\PHPParser\Node\Stmt\Declare_` -> `Stmt_Declare`

show more ...

Rename YYNLSTATES to numNonLeafStates

Clear parser state directly after parsing

I don't think this makes any difference in practical scenarios, but
it makes memory usage analysis simpler.

Fix PHP5 static call fixup

Variable nodes directly store the variable name as a string, they
don't use VarLikeIdentifier. So remove this wrapper if it exists.

Release PHP-Parser 4.0.0 Alpha 2

Use fully-qualified names for global constant references

Add bullet point summary to main README as well

Docs: Add performance section

FPPP: Optimize indentation calculation

Precalculate the indentation for every position. The previous
implementation was quadratic for long lines.

Update changelog

FPPP: Convert some checks to assertions

Don't just silently fall back if we receive illegal input.

Ensure nodes have full complement of location info

FPPP: Graceful handling of comment changes

Store start token position in comments

FPPP: Add support for removal from list nodes

Merge branch '3.x'

Conflicts:
CHANGELOG.md

Release PHP-Parser 3.1.2

Merge branch '3.x'

Conflicts:
lib/PhpParser/Builder/Namespace_.php
lib/PhpParser/Node/Stmt/ClassMethod.php
test/PhpParser/Builder/NamespaceTest.php